/**
 * Copyright (c) 2011-2025 libbitcoin developers (see AUTHORS)
 *
 * This file is part of libbitcoin.
 *
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU Affero General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU Affero General Public License for more details.
 *
 * You should have received a copy of the GNU Affero General Public License
 * along with this program.  If not, see <http://www.gnu.org/licenses/>.
 */
#ifndef LIBBITCOIN_SYSTEM_HASH_SHA_SHA512_HPP
#define LIBBITCOIN_SYSTEM_HASH_SHA_SHA512_HPP

#include <bitcoin/system/define.hpp>
#include <bitcoin/system/hash/sha/sha.hpp>

namespace libbitcoin {
namespace system {
namespace sha {

struct k512
  : public k<512, 80>
{
    // added constants (K)
    static constexpr constants_t get
    {
        // rounds 0..15
        0x428a2f98d728ae22, 0x7137449123ef65cd,
        0xb5c0fbcfec4d3b2f, 0xe9b5dba58189dbbc,
        0x3956c25bf348b538, 0x59f111f1b605d019,
        0x923f82a4af194f9b, 0xab1c5ed5da6d8118,
        0xd807aa98a3030242, 0x12835b0145706fbe,
        0x243185be4ee4b28c, 0x550c7dc3d5ffb4e2,
        0x72be5d74f27b896f, 0x80deb1fe3b1696b1,
        0x9bdc06a725c71235, 0xc19bf174cf692694,

        // rounds 15..31
        0xe49b69c19ef14ad2, 0xefbe4786384f25e3,
        0x0fc19dc68b8cd5b5, 0x240ca1cc77ac9c65,
        0x2de92c6f592b0275, 0x4a7484aa6ea6e483,
        0x5cb0a9dcbd41fbd4, 0x76f988da831153b5,
        0x983e5152ee66dfab, 0xa831c66d2db43210,
        0xb00327c898fb213f, 0xbf597fc7beef0ee4,
        0xc6e00bf33da88fc2, 0xd5a79147930aa725,
        0x06ca6351e003826f, 0x142929670a0e6e70,

        // rounds 32..47
        0x27b70a8546d22ffc, 0x2e1b21385c26c926,
        0x4d2c6dfc5ac42aed, 0x53380d139d95b3df,
        0x650a73548baf63de, 0x766a0abb3c77b2a8,
        0x81c2c92e47edaee6, 0x92722c851482353b,
        0xa2bfe8a14cf10364, 0xa81a664bbc423001,
        0xc24b8b70d0f89791, 0xc76c51a30654be30,
        0xd192e819d6ef5218, 0xd69906245565a910,
        0xf40e35855771202a, 0x106aa07032bbd1b8,

        // rounds 48..63
        0x19a4c116b8d2d0c8, 0x1e376c085141ab53,
        0x2748774cdf8eeb99, 0x34b0bcb5e19b48a8,
        0x391c0cb3c5c95a63, 0x4ed8aa4ae3418acb,
        0x5b9cca4f7763e373, 0x682e6ff3d6b2b8a3,
        0x748f82ee5defb2fc, 0x78a5636f43172f60,
        0x84c87814a1f0ab72, 0x8cc702081a6439ec,
        0x90befffa23631e28, 0xa4506cebde82bde9,
        0xbef9a3f7b2c67915, 0xc67178f2e372532b,

        // rounds 64..79
        0xca273eceea26619c, 0xd186b8c721c0c207,
        0xeada7dd6cde0eb1e, 0xf57d4f7fee6ed178,
        0x06f067aa72176fba, 0x0a637dc5a2c898a6,
        0x113f9804bef90dae, 0x1b710b35131c471b,
        0x28db77f523047d84, 0x32caab7b40c72493,
        0x3c9ebe0a15c9bebc, 0x431d67c49c100d4c,
        0x4cc5d4becb3e42b6, 0x597f299cfc657e2a,
        0x5fcb6fab3ad6faec, 0x6c44198c4a475817
    };
};

template <size_t Digest = 512,
    bool_if<Digest == 224 || Digest == 256 ||
            Digest == 384 || Digest == 512> = true>
struct h512
  : public h<k512, Digest>
{
    // Digest 224/256/384/512 have unique IV (specialize template).
};

template <>
struct h512<512>
  : public h<k512, 512>
{
    using state_t = typename h<k512, 512>::state_t;

    // initial value (H)
    static constexpr state_t get
    {
        0x6a09e667f3bcc908,
        0xbb67ae8584caa73b,
        0x3c6ef372fe94f82b,
        0xa54ff53a5f1d36f1,
        0x510e527fade682d1,
        0x9b05688c2b3e6c1f,
        0x1f83d9abfb41bd6b,
        0x5be0cd19137e2179
    };
};

template <>
struct h512<384>
  : public h<k512, 384>
{
    using state_t = typename h<k512, 384>::state_t;

    // initial value (H)
    static constexpr state_t get
    {
        0xcbbb9d5dc1059ed8,
        0x629a292a367cd507,
        0x9159015a3070dd17,
        0x152fecd8f70e5939,
        0x67332667ffc00b31,
        0x8eb44a8768581511,
        0xdb0c2e0d64f98fa7,
        0x47b5481dbefa4fa4
    };
};

template <>
struct h512<256>
  : public h<k512, 256>
{
    using state_t = typename h<k512, 256>::state_t;

    // initial value (H)
    static constexpr state_t get
    {
        0x22312194fc2bf72c,
        0x9f555fa3c84c64c2,
        0x2393b86b6f53b151,
        0x963877195940eabd,
        0x96283ee2a88effe3,
        0xbe5e1e2553863992,
        0x2b0199fc2c85b8aa,
        0x0eb72ddc81c52ca2
    };
};

template <>
struct h512<224>
  : public h<k512, 224>
{
    using state_t = typename h<k512, 224>::state_t;

    // initial value (H)
    static constexpr state_t get
    {
        0x8c3d37c819544da2,
        0x73e1996689dcd4d6,
        0x1dfab7ae32ff9c82,
        0x679dd514582f9fcf,
        0x0f6d2b697bd44da8,
        0x77e36f7304c48942,
        0x3f9d85a86a1d36c8,
        0x1112e6ad91d692a1
    };
};

} // namespace sha
} // namespace system
} // namespace libbitcoin

#endif
